Android Open Source - ivotingverification Secure Random Wrapper

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License

The source code is released under:

GNU General Public License

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Java Source Code

/**
 * Copyright (C) 2013 Eesti Vabariigi Valimiskomisjon 
 * (Estonian National Electoral Committee), www.vvk.ee
 *// w ww.ja va 2  s  .c o  m
 * Written in 2013 by AS Finestmedia, www.finestmedia.ee
 * 
 * Vote-verification application for Estonian Internet voting system
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 **/
 
package ee.vvk.ivotingverification.util;

import java.security.SecureRandom;

import ext.org.bouncycastle.util.encoders.Hex;

/**
 * Random generator with memory - used for OAEP padding manipulation
 * 
 * @version 25.04.2013
 */
public class SecureRandomWrapper extends SecureRandom {

  private byte[] next;
  private byte[] last;

  public SecureRandomWrapper() {
  }

  public SecureRandomWrapper(byte[] next) {
    setNextBytes(next);
  }

  @Override
  public void nextBytes(byte[] bytes) {
    if (next != null) {
      if (bytes.length != next.length) {
        throw new IllegalArgumentException(
            "bytes.length != next.length");
      }
      System.arraycopy(next, 0, bytes, 0, next.length);
      last = next;
      next = null;
    } else {
      super.nextBytes(bytes);
      last = new byte[bytes.length];
      System.arraycopy(bytes, 0, last, 0, bytes.length);
    }
  }

  public final void setNextBytes(byte[] bytes) {
    next = bytes == null ? null : Hex.decode(bytes);
  }

  public byte[] getLastBytes() {
    return last == null ? null : Hex.encode(last);
  }
}

Java Source Code List